Frequency inverter for speed adjustment of DS asynchronous motors, 0.18 to 4.0 kW, 200 to 240 V, 1~, 3~, 200 to 240 V, 1~, 3~
ER12 – Basic frequency inverter
The ER12 is the successor of the successful ER11 frequency inverter series. Based on the proven functions and the excellent quality, the ER12 has been further developed, improved and thus adapted to the new market requirements. With the pre-programmed factory software, the devices can be put into operation immediately in 95% of all applications.
The ER12 in protection class IP20 is available in two housing versions ER12-…K with heat sink and ER12-…B with base plate and reduced height. The addition U indicates the US version with a mains voltage of 1~ 100…120 V.
To open up new applications, numerous functions have been expanded and completely new ones created in ER12. A navigation wheel has been newly installed, which can also be used as a setpoint potentiometer. Also a local control with buttons and an analog output. The devices are low leakage current up to 0.75 kW < 3.5 mA. The output frequency has been increased to 400 Hz and the devices can be operated up to 50°C without declassification. Painted circuit boards and Modbus are standard. The power levels 3.0 and 4.0 kW have been added.
The frequency inverters of the ER12 series ( type K and B) have a mains filter class C1 integrated in the device, are CE marked according to the EU Low Voltage and EMC Directive and comply with the applicable product standard for frequency inverters EN 61800-3.
To achieve electromagnetic compatibility, the inverter must be operated with a built-in or external RFI filter.
When using shielded cables between the inverter and the motor, the shield must be connected to earth at both ends. Cable interruptions should be avoided as far as possible. If it is necessary to separate the cable, e.g. in order to install a motor contactor, then the cable shielding must be connected through as directly as possible. It is important to ensure that the lowest possible HF impedance is achieved.
The shorter the cable, the lower the radio interference and leakage current. The maximum possible cable lengths must be taken into account.
To avoid interference with the control inputs, control cables should always be shielded. The shield must be connected to the cable clamp provided on the inverter. If the shield is also connected to a control unit, ensure that the ground points are at the same potential.
Control cables should not cross power cables if possible. Where this cannot be avoided, a right-angle intersection is recommended.
Separate routing of control and power cables should be aimed for. If the cables have to be laid in parallel, e.g. on the same cable route, the greatest possible distance (> 20 cm) should be chosen.
The shielding of the installed cables should have a low RF impedance if possible. Therefore, copper braiding is preferable to steel braiding.
The HF contact resistance at the connection points between the shielding and the housing must be kept as low as possible. Dirt, paint and insulation residues on the housing and shielding in the area of the connections must therefore be removed. In principle, the cable clamps or crimp connections provided for this purpose should be used to connect the shielding. The use of earthing glands is advantageous.
The shielding should be applied to the housing as close as possible to the cable terminals. Longer, free cable ends act as antennas.
For unshielded cables, the cable cores should be twisted and output filters should be used.